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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8600c7dc6817af927f599dd671ea372b548e44a2ad29f0f32b55049f4dcd84e0' 
  AND token = 'R5daUbYPm08dtGbrtkyY7EBVXw/lPT7vPvt2nLVWTN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}